class_qwt_text_engine.html

QWT5.01用于Qt开发的二维图形库程序

          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>width</em></td>
        </tr>
        <tr>
          <td class="md"></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
        </tr>
      </table>
    </td>
  </tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
Find the height for a given width<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>font</em>&nbsp;</td><td>Font of the text </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>flags</em>&nbsp;</td><td>Bitwise OR of the flags used like in QPainter::drawText </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>text</em>&nbsp;</td><td>Text to be rendered </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>width</em>&nbsp;</td><td>Width</td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Calculated height </dd></dl>

<p>
Implemented in <a class="el" href="class_qwt_plain_text_engine.html#167f419dc7a3a172b59f78c9f480fd0d">QwtPlainTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#ff5b59b422c64eb30230b767675b0b79">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_math_m_l_text_engine.html#2af5e9efb10eee9c28cce50699cdfdab">QwtMathMLTextEngine</a>.    </td>
  </tr>
</table>
<a class="anchor" name="98316f2f6f4f50216ceffbe9babe2901"></a><!-- doxytag: member="QwtTextEngine::mightRender" ref="98316f2f6f4f50216ceffbe9babe2901" args="(const QString &amp;text) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top">virtual bool QwtTextEngine::mightRender           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QString &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>text</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [pure virtual]</code></td>
        </tr>
      </table>
    </td>
  </tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
Test if a string can be rendered by this text engine<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>text</em>&nbsp;</td><td>Text to be tested </td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>true, if it can be rendered </dd></dl>

<p>
Implemented in <a class="el" href="class_qwt_plain_text_engine.html#e7bd7417f0173e2d35fe1bf7a514ec9b">QwtPlainTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#42da46eee5fbda55e34b18c64b0b5e0b">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_math_m_l_text_engine.html#59ca5842c32fd12cfd2aeeef5c985600">QwtMathMLTextEngine</a>.    </td>
  </tr>
</table>
<a class="anchor" name="d84ebda640e65f23ebd758cd545a5b9a"></a><!-- doxytag: member="QwtTextEngine::textMargins" ref="d84ebda640e65f23ebd758cd545a5b9a" args="(const QFont &amp;font, const QString &amp;text, int &amp;left, int &amp;right, int &amp;top, int &amp;bottom) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top">virtual void QwtTextEngine::textMargins           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QFont &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>font</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const QString &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>text</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>left</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>right</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>top</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>bottom</em></td>
        </tr>
        <tr>
          <td class="md"></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
        </tr>
      </table>
    </td>
  </tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
Return margins around the texts<p>
The textSize might include margins around the text, like QFontMetrics::descent. In situations where texts need to be aligend in detail, knowing these margins might improve the layout calculations.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>font</em>&nbsp;</td><td>Font of the text </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>text</em>&nbsp;</td><td>Text to be rendered </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>left</em>&nbsp;</td><td>Return value for the left margin </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>right</em>&nbsp;</td><td>Return value for the right margin </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>top</em>&nbsp;</td><td>Return value for the top margin </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>bottom</em>&nbsp;</td><td>Return value for the bottom margin </td></tr>
  </table>
</dl>

<p>
Implemented in <a class="el" href="class_qwt_plain_text_engine.html#d14b14ba0f38576c7d562e5c5d70d8f3">QwtPlainTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#675bb28d8526fbcdbecc1833edffb980">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_math_m_l_text_engine.html#21ae25c70e4ff79cde60072e4bd75a29">QwtMathMLTextEngine</a>.    </td>
  </tr>
</table>
<a class="anchor" name="73214e1778edf6eb870fc96bf9c5091e"></a><!-- doxytag: member="QwtTextEngine::textSize" ref="73214e1778edf6eb870fc96bf9c5091e" args="(const QFont &amp;font, int flags, const QString &amp;text) const =0" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
  <tr>
    <td class="mdRow">
      <table cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td class="md" nowrap valign="top">virtual QSize QwtTextEngine::textSize           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QFont &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>font</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>flags</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const QString &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>text</em></td>
        </tr>
        <tr>
          <td class="md"></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
        </tr>
      </table>
    </td>
  </tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
Returns the size, that is needed to render text<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>font</em>&nbsp;</td><td>Font of the text </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>flags</em>&nbsp;</td><td>Bitwise OR of the flags like in for QPainter::drawText </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>text</em>&nbsp;</td><td>Text to be rendered</td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Caluclated size </dd></dl>

<p>
Implemented in <a class="el" href="class_qwt_plain_text_engine.html#3d6bd4659b061733ddfd9b3915077b75">QwtPlainTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#f6232e54a4991dcee4a7b3c783163537">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_math_m_l_text_engine.html#ecb16b442a1ff15418dc31860e11c27b">QwtMathMLTextEngine</a>.    </td>
  </tr>
</table>
<hr size="1"><address style="align: right;"><small>Generated on Mon Feb 26 21:26:10 2007 for Qwt User's Guide by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
</body>
</html>